Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/platform/scheduler/renderer/auto_advancing_virtual_time_domain_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/scheduler/renderer/auto_advancing_virtual_time_domain.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "platform/scheduler/base/task_queue_manager.h"
 #include "platform/scheduler/base/test_task_time_observer.h"
 #include "platform/scheduler/base/test_time_source.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 namespace scheduler {
 
-class AutoAdvancingVirtualTimeDomainTest : public testing::Test {
+class AutoAdvancingVirtualTimeDomainTest : public ::testing::Test {
  public:
   AutoAdvancingVirtualTimeDomainTest() {}
   ~AutoAdvancingVirtualTimeDomainTest() override {}
 
   void SetUp() override {
     clock_.reset(new base::SimpleTestTickClock());
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
 
     test_time_source_.reset(new TestTimeSource(clock_.get()));
     mock_task_runner_ = make_scoped_refptr(
@@ skipping 58 matching lines @@
 
   mock_task_runner_->RunUntilIdle();
 
   EXPECT_EQ(initial_time_, clock_->NowTicks());
   EXPECT_EQ(initial_time_, auto_advancing_time_domain_->CreateLazyNow().Now());
   EXPECT_FALSE(task_run);
 }
 
 }  // namespace scheduler
 }  // namespace blink